How to Cite

Author Information

Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina

*Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599. E-mail: david.richardson@unc.edu

Disclosure statement: This work was funded by the National Institute for Occupational Safety and Health of the Centers for Disease Control and Prevention. Aside from the federal government of the United States, the authors have no affiliation with an organization that to their knowledge has a direct interest in the subject matter or materials discussed.

Publication History

Issue published online: 17 JUN 2013

Article first published online: 4 MAR 2013

Manuscript Accepted: 9 JAN 2013

Funded by

National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention. Grant Number: R01 OH009471